The present invention provides a high-frequency circuit capable of acquiring the original transmission characteristics of a filter by preventing capacitive coupling between input and output terminals of the filter externally attached to the integrated circuit and effectively using a mounting space. The high-frequency circuit includes a rectangular integrated circuit 10 having two long sides 10a and 10b and two short sides 10c and 10d and a SAW filter 15, disposed to be adjacent to the short side 10d of the integrated circuit 10, having input terminals 24a and 24b disposed on the long side 10a side and output terminals 28a and 28b disposed on the other long side 10b side. IC output terminals 22a and 22b connected to input terminals 24a and 24b of the SAW filter 15 are disposed on a position of one long side 10a of the integrated circuit 10 on the SAW filter 15 side, and IC input terminals 26a and 26b connected to output terminals 28a and 28b of the SAW filter 15 are disposed on a position of the other long side 10b of the integrated circuit 10 on the SAW filter 15 side.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A high-frequency circuit comprising: a rectangular integrated circuit having first and second sides which face with each other and third and fourth sides which face with each other; and a high-frequency filter disposed adjacent to the third side of the integrated circuit, the high-frequency filter having: an input terminal disposed on a side located on a same side as the first side; and an output terminal disposed on another side located on a same side as the second side, wherein the rectangular integrated circuit comprises: a first terminal configured to output a high-frequency signal, the first terminal being provided on the first side and connected to the input terminal of the high-frequency filter; and a second terminal configured to receive a filtered high-frequency signal, the second terminal being provided on the second side and connected to the output terminal of the high-frequency filter, and wherein the high-frequency circuit further comprises: a ground pattern provided between the first side and the second side along a center line of the integrated circuit, the ground pattern extending to the high-frequency filter between the input terminal and the output terminal along a center line of the high-frequency filter.
2. The high-frequency circuit according to claim 1 , wherein the high-frequency filter is a SAW filter.
3. The high-frequency circuit according to claim 1 , wherein the rectangular integrated circuit further comprises: a pair of ground terminals provided on both sides of and adjacent to the first and second terminals.
4. The high-frequency circuit according to claim 1 , wherein a television signal is converted into an intermediate frequency signal by the integrated circuit, the intermediate frequency signal is input to the high-frequency filter through the first terminal, an unnecessary frequency component is removed from the intermediate frequency signal by the high-frequency filter, the intermediate frequency signal from which the unnecessary frequency component has been removed is input to the integrated circuit through the second terminal again, and an output signal optimized for digital television signal processing is acquired.
5. The high-frequency circuit according to claim 1 , wherein the first terminal is positioned on the first side closer to the third side than to the forth side, and the second terminal is positioned on the second side closer to the third side than to the forth side.
6. The high-frequency circuit according to claim 1 , wherein the integrated circuit comprises: an input terminal configured to receive an RF input signal to be processed in the high-frequency circuit; and an output terminal configured to output an output signal processed through the high-frequency circuit.
7. The high-frequency circuit according to claim 3 , wherein one of the ground terminals adjacent to the second terminal is grounded through a high-frequency coupling.
8. The high-frequency circuit according to claim 1 , wherein: the integrated circuit is configured to receive and convert a television signal into an intermediate high-frequency signal and output the intermediate high-frequency signal from the first terminal; the high-frequency filter is configured to receive and filter the intermediate high-frequency signal so as to remove an undesirable frequency component from the intermediate high-frequency signal, and output a filtered intermediate high-frequency signal; and the integrated circuit is further configured to receive the filtered intermediate high-frequency signal at the second terminal, and obtain an output signal optimized for digital television signal processing.
9. The high-frequency circuit according to claim 1 , wherein a capacitive coupling between the input terminal and the output terminal of the high-frequency filter is prevented by providing the first terminal on the first side and the second terminal on the second side opposite to the first side.
10. The high-frequency circuit according to claim 1 , wherein the rectangular integrated circuit has no terminal on the third side which is connected to the input terminal or the output terminal of the high-frequency filter.
11. The high-frequency circuit according to claim 1 , wherein the input terminal of the high-frequency filter is coupled only to the first terminal on the first side, and the output terminal of the high-frequency filter is coupled only to the second terminal on the second side.
12. A high-frequency circuit comprising: a rectangular integrated circuit configured to receive and process an RF input signal and output a processed signal, the integrated circuit including: a first side; a second side opposite to the first side; a third side; a forth side opposite to the third side; a first terminal configured to output a high-frequency signal, the first terminal being provided on the first side; and a second terminal configured to receive a filtered high-frequency signal, the second terminal being provided on the second side; a high-frequency filter configured to filter the high-frequency signal to remove an undesired component therefrom and output the filtered high-frequency signal, the high-frequency filter being provided adjacent to the third side of the integrated circuit and including: an input terminal configured to receive the high-frequency signal, the input terminal being connected to the first terminal on the first side; and an output terminal configured to output the filtered high-frequency signal, the output terminal being connected to the second terminal on the second side; and a ground pattern provided between the first side and the second side along a center line of the integrated circuit, the ground pattern extending to the high-frequency filter between the input terminal and the output terminal along a center line of the high-frequency filter.
13. The high-frequency circuit according to claim 12 , wherein the first terminal is positioned on the first side closer to the third side than to the forth side, and the second terminal is positioned on the second side closer to the third side than to the forth side.
14. The high-frequency circuit according to claim 12 , wherein the rectangular integrated circuit further comprises: a pair of ground terminals provided on both sides of and adjacent to the first and second terminals.
15. The high-frequency circuit according to claim 14 , wherein one of the ground terminals adjacent to the second terminal is grounded through a high-frequency coupling.
16. The high-frequency circuit according to claim 12 , wherein a capacitive coupling between the input terminal and the output terminal of the high-frequency filter is prevented by providing the first terminal on the first side and the second terminal on the second side opposite to the first side.
17. The high-frequency circuit according to claim 12 , wherein the rectangular integrated circuit has no terminal on the third side which is connected to the input terminal or the output terminal of the high-frequency filter.
18. The high-frequency circuit according to claim 12 , wherein the input terminal of the high-frequency filter is coupled only to the first terminal on the first side, and the output terminal of the high-frequency filter is coupled only to the second terminal on the second side.
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November 15, 2007
April 16, 2013
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